09921-3 – Acer Aspire 3820
The 09921-3 (Wistron) motherboard is found in the Acer Aspire 3820, Acer 3820ZG, Acer Aspire 3820TG and Acer JM31. 5 files are indexed for this board: 4 BIOS files, 1 schematic and 2 EC firmware images.
Revisions seen in file names: 1.0. First posted in August 2021 in BIOS Archive, Schematics & Boardviews Archive and Cyberlan Electronics.
BIOS dumps 4
Schematics 1
Board facts
| Board number | 09921-3 |
|---|---|
| Designed by | Wistron |
| Platform group | 09XXX |
| Also known as | 48.4HL01.031 |
| Revisions | 1.0 |
| First seen | 2021-08-15 |
| Source channels | BIOS Archive, Schematics & Boardviews Archive, Cyberlan Electronics |
| About the number | Wistron board numbers look like 15217-1; the first two digits usually indicate the design year. |
Laptops that use 09921-3
- Acer Aspire 3820
- Acer 3820ZG
- Acer Aspire 3820TG
- Acer JM31
- Acer JM31-CP
What these files are for
A BIOS dump is a full image of the board's SPI flash chip. It is written back with an SPI programmer when the original firmware is corrupted, after a chip replacement, or to recover from a failed update. Read and save the original chip first: serial number, DMI data and the Intel ME / AMD PSP state differ between boards.
A schematic is the circuit diagram of the main board: power rails, power-up sequence, component values and net names. It is the reference for measuring voltages and tracing a fault.
EC (embedded controller) firmware runs the keyboard controller, power sequencing, battery charging and fans. Depending on the board it lives in a separate chip (ENE KB9012, ITE IT85xx, Nuvoton NPCE) or inside the main SPI image, so check which applies before flashing.
Tools to open these files
| Format | What it is | Open with |
|---|---|---|
| PDF schematic | any PDF reader; Sumatra PDF and Foxit handle large schematics well | |
| .rar | RAR archive | 7-Zip or WinRAR |
| .zip | ZIP archive | 7-Zip, WinRAR or the built-in Windows extractor |
| .bin | BIOS image inside the archive (usually .bin) | a CH341A, XGecu T48 / TL866II Plus or RT809H programmer |
Questions
Is there a boardview for 09921-3?
No boardview has been indexed for 09921-3 yet; the schematic is available on this page.
Which laptops use the 09921-3 board?
Files in the catalog link 09921-3 to the Acer Aspire 3820, Acer 3820ZG, Acer Aspire 3820TG, Acer JM31 and Acer JM31-CP.
Who designed the 09921-3 board?
09921-3 is a Wistron board number used by Acer.
Where do the download links go?
Each button opens the original public Telegram post the file was shared in. ChambersDesignInc.com only indexes and cross-references those posts.